CVE catalog

CVE-2026-58055

nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and C

[CVE catalog]

Severity
Medium · CVSS 6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
Source
[NVD] · [CVE record]
EPSS
0.25% · Oct 25, 2026

nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiannghttp2sid1.70.0-1fixed
Debiannghttp2forky1.70.0-1fixed
Debiannghttp2trixie1.64.0-1.1+deb13u1vulnerable
Debiannghttp2trixie-security1.64.0-1.1+deb13u1vulnerable
Debiannghttp2bookworm1.52.0-1+deb12u3vulnerable
Debiannghttp2bookworm-security1.52.0-1+deb12u3vulnerable
Cpenghttp2Not reported1.59.0-1ubuntu0.4fixed
Cpelibnghttp2-14Not reported1.59.0-1ubuntu0.4fixed
Cpelibnghttp2-devNot reported1.59.0-1ubuntu0.4fixed
Cpelibnghttp2-docNot reported1.59.0-1ubuntu0.4fixed
Cpenghttp2-clientNot reported1.59.0-1ubuntu0.4fixed
Cpenghttp2-proxyNot reported1.59.0-1ubuntu0.4fixed
Cpenghttp2-serverNot reported1.59.0-1ubuntu0.4fixed
Cpenghttp2Not reportedNot reportedvulnerable
Cpenghttp2Not reportedNot reportedunknown
Alpinenghttp23.241.70.0-r0fixed
Susenghttp2linux enterprise module for basesystem 15 sp71.64.0-150700.3.6.1fixed
Susenghttp2linux micro 6.11.52.0-slfo.1.1_3.1fixed
Susenghttp2linux micro 6.01.52.0-7.1fixed
Susenghttp2linux enterprise module for basesystem 15 sp71.40.0-150600.25.8.1fixed
Susenghttp2linux enterprise server ltss extended security 12 sp51.39.2-3.26.1fixed
Susenghttp2linux enterprise server 16.01.64.0-160000.4.1fixed
Susenghttp2linux enterprise server for sap applications 16.01.64.0-160000.4.1fixed
Susenghttp2linux micro 6.21.64.0-160000.4.1fixed
Susenghttp2linux enterprise micro 5.31.40.0-150200.25.1fixed
Susenghttp2linux enterprise micro 5.41.40.0-150200.25.1fixed
Susenghttp2linux enterprise micro 5.51.40.0-150200.25.1fixed
Opensusenghttp2leap 16.01.64.0-160000.4.1fixed
Ubuntunghttp222.041.43.0-1vulnerable
Ubuntunghttp222.041.43.0-1build1vulnerable
Ubuntunghttp222.041.43.0-1build2vulnerable
Ubuntunghttp222.041.43.0-1build3vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.1vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.2vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.3vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.4fixed
Ubuntunghttp224.041.55.1-1vulnerable
Ubuntunghttp224.041.57.0-1vulnerable
Ubuntunghttp224.041.58.0-1vulnerable
Ubuntunghttp224.041.59.0-1vulnerable
Ubuntunghttp224.041.59.0-1build1vulnerable
Ubuntunghttp224.041.59.0-1build2vulnerable
Ubuntunghttp224.041.59.0-1build4vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.1vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.2vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.3vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.4fixed
Ubuntunghttp225.101.64.0-1ubuntu1vulnerable
Ubuntunghttp225.101.64.0-1.1vulnerable
Ubuntunghttp225.101.64.0-1.1build1vulnerable
Ubuntunghttp225.101.64.0-1.1ubuntu1vulnerable
Ubuntunghttp225.101.64.0-1.1ubuntu1.1vulnerable
Ubuntunghttp225.101.64.0-1.1ubuntu1.2fixed
Ubuntunghttp226.041.64.0-1.1ubuntu1vulnerable
Ubuntunghttp226.041.64.0-1.1ubuntu2vulnerable
Ubuntunghttp226.041.68.0-1vulnerable
Ubuntunghttp226.041.68.0-2vulnerable
Ubuntunghttp226.041.68.0-2ubuntu0.1vulnerable
Ubuntunghttp226.041.68.0-2ubuntu0.2fixed
Ubuntunghttp2pro1.39.2-1vulnerable
Ubuntunghttp2pro1.40.0-1vulnerable
Ubuntunghttp2pro1.40.0-1build1vulnerable
Ubuntunghttp2pro1.40.0-1ubuntu0.1vulnerable
Ubuntunghttp2pro1.40.0-1ubuntu0.2vulnerable
Ubuntunghttp2pro1.40.0-1ubuntu0.3vulnerable
Ubuntunghttp2pro1.40.0-1ubuntu0.3+esm1vulnerable
Ubuntunghttp222.041.43.0-1vulnerable
Ubuntunghttp222.041.43.0-1build1vulnerable
Ubuntunghttp222.041.43.0-1build2vulnerable
Ubuntunghttp222.041.43.0-1build3vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.1vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.2vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.3vulnerable
Ubuntunghttp222.041.43.0-1ubuntu0.4fixed
Ubuntunghttp224.041.55.1-1vulnerable
Ubuntunghttp224.041.57.0-1vulnerable
Ubuntunghttp224.041.58.0-1vulnerable
Ubuntunghttp224.041.59.0-1vulnerable
Ubuntunghttp224.041.59.0-1build1vulnerable
Ubuntunghttp224.041.59.0-1build2vulnerable
Ubuntunghttp224.041.59.0-1build4vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.1vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.2vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.3vulnerable
Ubuntunghttp224.041.59.0-1ubuntu0.4fixed
Ubuntunghttp225.101.64.0-1ubuntu1vulnerable
Ubuntunghttp225.101.64.0-1.1vulnerable
Ubuntunghttp225.101.64.0-1.1build1vulnerable
Ubuntunghttp225.101.64.0-1.1ubuntu1vulnerable
Ubuntunghttp225.101.64.0-1.1ubuntu1.1vulnerable
Ubuntunghttp225.101.64.0-1.1ubuntu1.2fixed
Ubuntunghttp226.041.64.0-1.1ubuntu1vulnerable
Ubuntunghttp226.041.64.0-1.1ubuntu2vulnerable
Ubuntunghttp226.041.68.0-1vulnerable
Ubuntunghttp226.041.68.0-2vulnerable
Ubuntunghttp226.041.68.0-2ubuntu0.1vulnerable
Ubuntunghttp226.041.68.0-2ubuntu0.2fixed
Opensusenghttp2tumbleweed1.69.0-2.1fixed
Cpenghttp2Not reportedNot reportedunknown

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiannghttp2sourcesid1.70.0-1not yet assignedNot reported[1140917]
Debiannghttp2sourceforky1.70.0-1not yet assignedNot reported[1140917]
Debiannghttp2sourcetrixie(unfixed)not yet assignedNot reported[1140917]
Debiannghttp2sourcebookworm(unfixed)not yet assignedNot reported[1140917]
Cpenghttp2cpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Cpelibnghttp2-14cpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Cpelibnghttp2-devcpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Cpelibnghttp2-doccpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Cpenghttp2-clientcpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Cpenghttp2-proxycpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Cpenghttp2-servercpeNot reported1.59.0-1ubuntu0.4Not reportedNot reportedNot reported
Alpinenghttp2apk3.241.70.0-r0Not reportedALPINE-CVE-2026-58055Not reported
Susenghttp2rpmlinux enterprise module for basesystem 15 sp71.64.0-150700.3.6.1Not reportedSUSE-SU-2026:4029-1Not reported
Susenghttp2rpmlinux micro 6.11.52.0-slfo.1.1_3.1Not reportedSUSE-SU-2026:22893-1Not reported
Susenghttp2rpmlinux micro 6.01.52.0-7.1Not reportedSUSE-SU-2026:22707-1Not reported
Susenghttp2rpmlinux enterprise module for basesystem 15 sp71.40.0-150600.25.8.1Not reportedSUSE-SU-2026:3153-1Not reported
Susenghttp2rpmlinux enterprise server ltss extended security 12 sp51.39.2-3.26.1Not reportedSUSE-SU-2026:3154-1Not reported
Susenghttp2rpmlinux enterprise server 16.01.64.0-160000.4.1Not reportedSUSE-SU-2026:22630-1Not reported
Susenghttp2rpmlinux enterprise server for sap applications 16.01.64.0-160000.4.1Not reportedSUSE-SU-2026:22630-1Not reported
Susenghttp2rpmlinux micro 6.21.64.0-160000.4.1Not reportedSUSE-SU-2026:22594-1Not reported
Susenghttp2rpmlinux enterprise micro 5.31.40.0-150200.25.1Not reportedSUSE-SU-2026:2883-1Not reported
Susenghttp2rpmlinux enterprise micro 5.41.40.0-150200.25.1Not reportedSUSE-SU-2026:2883-1Not reported
Susenghttp2rpmlinux enterprise micro 5.51.40.0-150200.25.1Not reportedSUSE-SU-2026:2883-1Not reported
Opensusenghttp2rpmleap 16.01.64.0-160000.4.1Not reportedOPENSUSE-SU-2026:21302-1Not reported
Ubuntunghttp2deb22.041.43.0-1ubuntu0.4Not reportedUSN-8495-1Not reported
Ubuntunghttp2deb24.041.59.0-1ubuntu0.4Not reportedUSN-8495-1Not reported
Ubuntunghttp2deb25.101.64.0-1.1ubuntu1.2Not reportedUSN-8495-1Not reported
Ubuntunghttp2deb26.041.68.0-2ubuntu0.2Not reportedUSN-8495-1Not reported
Ubuntunghttp2deb22.041.43.0-1ubuntu0.4Not reportedUBUNTU-CVE-2026-58055Not reported
Ubuntunghttp2deb24.041.59.0-1ubuntu0.4Not reportedUBUNTU-CVE-2026-58055Not reported
Ubuntunghttp2deb25.101.64.0-1.1ubuntu1.2Not reportedUBUNTU-CVE-2026-58055Not reported
Ubuntunghttp2deb26.041.68.0-2ubuntu0.2Not reportedUBUNTU-CVE-2026-58055Not reported
Opensusenghttp2rpmtumbleweed1.69.0-2.1Not reportedOPENSUSE-SU-2026:11156-1Not reported

[Debian bug #1140917]

Notes

[trixie] nghttp2: Minor issue [bookworm] nghttp2: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libnghttp2-14]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.52.0-1+deb12u3 · amd64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

  • [libnghttp2-dev]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.52.0-1+deb12u3 · amd64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

  • [libnghttp2-doc]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.52.0-1+deb12u3 · all · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · all · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · all · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · all · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

  • [nghttp2]Affected
    Details (4)
    • 1.52.0-1+deb12u3 · all · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · all · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · all · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · all · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

  • [nghttp2-client]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.52.0-1+deb12u3 · amd64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

  • [nghttp2-proxy]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.52.0-1+deb12u3 · amd64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

  • [nghttp2-server]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.52.0-1+deb12u3 · amd64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

    • 1.52.0-1+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · nghttp2 · debian · bookworm; nvd · nghttp2 · debian · 12

[Debian 13 (Trixie)]

  • [libnghttp2-14]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.64.0-1.1+deb13u1 · amd64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · amd64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

  • [libnghttp2-dev]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.64.0-1.1+deb13u1 · amd64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · amd64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

  • [libnghttp2-doc]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.64.0-1.1+deb13u1 · all · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · all · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · all · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · all · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

  • [nghttp2]Affected
    Details (4)
    • 1.64.0-1.1+deb13u1 · all · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · all · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · all · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · all · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

  • [nghttp2-client]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.64.0-1.1+deb13u1 · amd64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · amd64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

  • [nghttp2-proxy]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.64.0-1.1+deb13u1 · amd64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · amd64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

  • [nghttp2-server]Affected

    Source package: [nghttp2]

    Details (4)
    • 1.64.0-1.1+deb13u1 · amd64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · amd64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

    • 1.64.0-1.1+deb13u1 · arm64 · trixie-security

      Affected

      nvd · nghttp2 · debian · 13

[openSUSE Tumbleweed]

  • [libnghttp2-14]Unknown

    Source package: [nghttp2]

    Details (1)
    • 1.70.0-1.1 · x86_64 · tumbleweed

      Unknown · Fixed: 1.69.0-2.1

      Version impact unknown

      nvd · nghttp2 · opensuse · tumbleweed

  • Source package: [nghttp2]

    Details (1)
    • 1.70.0-1.1 · x86_64 · tumbleweed

      Unknown · Fixed: 1.69.0-2.1

      Version impact unknown

      nvd · nghttp2 · opensuse · tumbleweed

  • Source package: [nghttp2]

    Details (1)
    • 1.70.0-1.1 · x86_64 · tumbleweed

      Unknown · Fixed: 1.69.0-2.1

      Version impact unknown

      nvd · nghttp2 · opensuse · tumbleweed

  • [nghttp2-doc]Unknown

    Source package: [nghttp2]

    Details (1)
    • 1.70.0-1.1 · noarch · tumbleweed

      Unknown · Fixed: 1.69.0-2.1

      Version impact unknown

      nvd · nghttp2 · opensuse · tumbleweed

  • [nghttp2]Fixed

    Source package: [nghttp2]

    Details (1)
    • 1.70.0-1.1 · x86_64 · tumbleweed

      Fixed · Fixed: 1.69.0-2.1

      nvd · nghttp2 · opensuse · tumbleweed

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]