CVE catalog

CVE-2024-52811

ngtcp2: CVE-2024-52811

Severity: High · CVSS 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published: Nov 25, 2024, 6:55:36 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.84% · Oct 25, 2026

The ngtcp2 project is an effort to implement IETF QUIC protocol in C. In affected versions acks are not validated before being written to the qlog leading to a buffer overflow. In `ngtcp2_conn::conn_recv_pkt` for an ACK, there was new logic that got added to skip `conn_recv_ack` if an ack has already been processed in the payload. However, this causes us to also skip `ngtcp2_pkt_validate_ack`. The ack which was skipped still got written to qlog. The bug occurs in `ngtcp2_qlog::write_ack_frame`. It is now possible to reach this code with an invalid ack, suppose `largest_ack=0` and `first_ack_range=15`. Subtracting `largest_ack - first_ack_range` will lead to an integer underflow which is 20 chars long. However, the ngtcp2 qlog code assumes the number written is a signed integer and only accounts for 19 characters of overhead (see `NGTCP2_QLOG_ACK_FRAME_RANGE_OVERHEAD`). Therefore, we overwrite the buffer causing a heap overflow. This is high priority and could potentially impact many users if they enable qlog. qlog is disabled by default. Due to its overhead, it is most likely used for debugging purpose, but the actual use is unknown. ngtcp2 v1.9.1 fixes the bug and users are advised to upgrade. Users unable to upgrade should not turn on qlog.

Vulnerable and fixed packages

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

Distribution	Package	Release	Version	Status
Debian	ngtcp2	sid	`1.24.0-1`	not affected
Debian	ngtcp2	forky	`1.24.0-1`	not affected
Debian	ngtcp2	trixie	`1.11.0-1+deb13u1`	not affected
Debian	ngtcp2	trixie-security	`1.11.0-1+deb13u1`	not affected
Debian	ngtcp2	bookworm	`0.12.1+dfsg-1+deb12u1`	not affected
Debian	ngtcp2	bookworm-security	`0.12.1+dfsg-1+deb12u1`	not affected
Opensuse	ngtcp2	tumbleweed	`1.10.0-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ngtcp2	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	ngtcp2	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	ngtcp2	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	ngtcp2	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Opensuse	ngtcp2	rpm	tumbleweed	`1.10.0-1.1`	Not reported	OPENSUSE-SU-2025:14766-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[libngtcp2-16]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2-16-32bit]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_boringssl0]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_boringssl-devel]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_gnutls8]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_gnutls8-32bit]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_gnutls-devel]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_ossl0]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_ossl0-32bit]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[libngtcp2_crypto_ossl-devel]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed
[ngtcp2-devel]Unknown
Source package: [ngtcp2]
Details (1)
- 1.25.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 1.10.0-1.1
  Version impact unknown
  dsa · ngtcp2 · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[libngtcp2-16]Not affected
Source package: [ngtcp2]
Details (2)
- 1.11.0-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
[libngtcp2-9]Not affected
Source package: [ngtcp2]
Details (4)
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
[libngtcp2-crypto-gnutls2]Not affected
Source package: [ngtcp2]
Details (4)
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
[libngtcp2-crypto-gnutls8]Not affected
Source package: [ngtcp2]
Details (2)
- 1.11.0-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
[libngtcp2-crypto-gnutls-dev]Not affected
Source package: [ngtcp2]
Details (6)
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
[libngtcp2-dev]Not affected
Source package: [ngtcp2]
Details (6)
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
[ngtcp2-client]Not affected
Source package: [ngtcp2]
Details (6)
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
[ngtcp2-server]Not affected
Source package: [ngtcp2]
Details (6)
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 1.11.0-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm
- 0.12.1+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ngtcp2 · debian · bookworm

Observed: Oct 27, 2026, 6:46:59 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]