OSV-2026-561 Global-buffer-overflow in nameMatch
A global buffer overflow in KMime's nameMatch function allows attackers to cause denial of service or potentially execute code via crafted MIME headers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2026-561?
OSV-2026-561 is a memory corruption vulnerability in kmime, published on 11 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=500975977
Crash type: Global-buffer-overflow READ 1
Crash state:
nameMatch
QStringConverter::QStringConverter
KMime::HeaderParsing::parseEncodedWord
Which versions are affected by OSV-2026-561?
1 open source package ship an affected version, including kmime.
| Package | Affected | Fixed in |
|---|---|---|
kmime OSS-Fuzz | All versions | None |
How do I fix OSV-2026-561?
No fix has been published for OSV-2026-561 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2026-561 being exploited?
There is no known exploitation of OSV-2026-561 in the wild and no public exploit code.