CVE-2026-5244CRITICAL 9.8EPSS p49.3%

CVE-2026-5244CVE-2026-5244

Description

A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pubkey leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 7.21 mitigates this issue. The name of the patch is 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. It is advisable to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.73% probability of exploitation · percentile 49.3% · 2026-06-19T12:03:05Z
Published2026-04-02
Last modified2026-04-29

Underlying weaknesses· 2

CWE-119CWE-122

References

  1. https://github.com/cesanta/mongoose/
  2. https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1
  3. https://github.com/cesanta/mongoose/releases/tag/7.21
  4. https://vuldb.com/submit/770063
  5. https://vuldb.com/vuln/354825
  6. https://vuldb.com/vuln/354825/cti

2

TypeTargetConfidenceTier
WeaknessImproper Restriction of Operations within the Bounds of a Memory Buffercwe-1190%live
WeaknessHeap-based Buffer Overflowcwe-1220%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2026-5246
CVE
CVE-2026-5245
CVE
CVE-2026-5604
CVE
CVE-2026-2646
CVE
CVE-2026-5264
CVE
CVE-2026-7383
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.