OSV-2026-733 Use-of-uninitialized-value in JBIG2Stream::readSymbolDictSeg
An attacker can cause a denial of service by providing a crafted JBIG2 stream that triggers the use of an uninitialized value in the parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2026-733?
OSV-2026-733 is a memory corruption vulnerability in poppler, published on 14 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=512468082
Crash type: Use-of-uninitialized-value
Crash state:
JBIG2Stream::readSymbolDictSeg
JBIG2Stream::readSegments
JBIG2Stream::rewind
Which versions are affected by OSV-2026-733?
1 open source package ship an affected version, including poppler.
| Package | Affected | Fixed in |
|---|---|---|
poppler OSS-Fuzz | All versions | None |
How do I fix OSV-2026-733?
No fix has been published for OSV-2026-733 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-2026-733 being exploited?
There is no known exploitation of OSV-2026-733 in the wild and no public exploit code.