CVE catalog

CVE-2026-55958

Out-of-bounds write in the Renesas TSIP TLS 1.3…

[CVE catalog]

Out-of-bounds write in the Renesas TSIP TLS 1.3 transcript buffer. In tsip_StoreMessage() the capacity check guarding the fixed message bag (MSGBAG_SIZE) sets an error code but fails to return, so execution falls through to an XMEMCPY that writes past the end of the buffer once the accumulated TLS 1.3 handshake transcript exceeds MSGBAG_SIZE (8 KB), corrupting adjacent heap state and potentially causing a remote denial of service crash. The bag is sized to hold a normal handshake, so this is reached only by an unusually large but valid certificate chain, or by a malicious or man-in-the-middle server sending an oversized handshake message to a client that does not strictly verify the chain. This only affects builds using the Renesas TSIP TLS port (WOLFSSL_RENESAS_TSIP_TLS) as a TLS 1.3 client on Renesas MCUs with TSIP hardware enabled, and is rated High within those builds. All other configurations are unaffected.

Severity
High · CVSS 8.3
Published
Source
[NVD] · [CVE record]
EPSS
0.44% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "wolfssl",
      "status": "fixed",
      "release": "sid",
      "version": "5.9.2-1.2"
    },
    {
      "name": "wolfssl",
      "status": "vulnerable",
      "release": "trixie",
      "version": "5.7.2-0.1+deb13u2"
    },
    {
      "name": "wolfssl",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "5.5.4-2+deb12u2"
    },
    {
      "name": "wolfssl",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "5.5.4-2+deb12u3"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1140815,
      "name": "wolfssl",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "5.9.2-1"
    },
    {
      "bug": 1140815,
      "name": "wolfssl",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1140815,
      "name": "wolfssl",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "end-of-life",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "wolfssl",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "wolfssl",
      "ecosystem": "cpe",
      "fixed_version": "5.9.2"
    }
  ]
}

[Debian bug #1140815]

Publisher notes

[trixie] wolfssl: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [libwolfssl35]Unknown

    Source package: [wolfssl]

    Details (4)

    • 5.5.4-2+deb12u2 · amd64 · bookworm

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

    • 5.5.4-2+deb12u2 · arm64 · bookworm

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

    • 5.5.4-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

    • 5.5.4-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

  • [libwolfssl-dev]Unknown

    Source package: [wolfssl]

    Details (4)

    • 5.5.4-2+deb12u2 · amd64 · bookworm

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

    • 5.5.4-2+deb12u2 · arm64 · bookworm

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

    • 5.5.4-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

    • 5.5.4-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · wolfssl · debian · bookworm; nvd · wolfssl · debian · 12

[Debian 13 (Trixie)]

  • [libwolfssl42t64]Unknown

    Source package: [wolfssl]

    Details (2)

    • 5.7.2-0.1+deb13u1 · amd64 · trixie

      Affected

      nvd · wolfssl · debian · 13

    • 5.7.2-0.1+deb13u1 · arm64 · trixie

      Affected

      nvd · wolfssl · debian · 13

  • [libwolfssl-dev]Unknown

    Source package: [wolfssl]

    Details (2)

    • 5.7.2-0.1+deb13u1 · amd64 · trixie

      Affected

      nvd · wolfssl · debian · 13

    • 5.7.2-0.1+deb13u1 · arm64 · trixie

      Affected

      nvd · wolfssl · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]