Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : GNU Bison vulnerability (USN-8777-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-8777-1 advisory. It was discovered that GNU Bison incorrectly handled grammar-defined configuration variables when generating HTML reports. An attacker cou...

USN-8777-1: GNU Bison vulnerability

It was discovered that GNU Bison incorrectly handled grammar-defined configuration variables when generating HTML reports. An attacker could possibly use this issue to execute arbitrary code...

USN-8777-1 bison vulnerability

It was discovered that GNU Bison incorrectly handled grammar-defined configuration variables when generating HTML reports. An attacker could possibly use this issue to execute arbitrary code...

JLSEC-2026-1345 GNU Bison allows for an execution of an arbitrary program during HTML report generation due to...

GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handling of grammar-defined configuration variables. A grammar file can override the executable used for the XML‑to‑HTML transformation step via %define tool.xsltproc, which is accepted without...

JLSEC-2026-1346 GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and...

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing...

CVE-2026-56389

A flaw was found in GNU Bison. During HTML report generation, the software improperly handles grammar-defined configuration variables. An attacker can provide a specially crafted grammar file that overrides the executable used for XML-to-HTML transformation. This allows for the execution of an...

Arbitrary Output Location Change in GNU Bison

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Arbitrary Command Execution in GNU Bison

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OESA-2026-3305 bison security update

Bison is a general-purpose parser generator that converts an annotated context-free grammar into a deterministic LR or generalized LR GLR parser employing LALR1 parser tables. As an experimental feature, Bison can also generate IELR1 or canonical LR1 parser tables. Once you are proficient with...

CVE-2026-56390

A flaw was found in GNU Bison. When processing attacker-supplied grammar, the software improperly handles grammar-defined output paths. This allows an attacker to use directives such as %output and %header to specify arbitrary file paths. Consequently, generated files can be directed to any...

SUSE CVE-2026-56389

GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handling of grammar-defined configuration variables. A grammar file can override the executable used for the XML-to-HTML transformation step via %define tool.xsltproc, which is accepted without...

SUSE CVE-2026-56390

GNU Bison improperly handles grammar-defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller-supplied output options. When processing attacker-supplied grammar, this behavior allows directing...

AZL-94136 CVE-2026-56390 affecting package bison for versions less than 3.8.2-2

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing...

CVE-2026-56390

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing...

AZL-94133 CVE-2026-56389 affecting package bison for versions less than 3.8.2-2

GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handling of grammar-defined configuration variables. A grammar file can override the executable used for the XML‑to‑HTML transformation step via %define tool.xsltproc, which is accepted without...

CVE-2026-56390

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing...

UBUNTU-CVE-2026-56390

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing...

CVE-2026-56389

GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handling of grammar-defined configuration variables. A grammar file can override the executable used for the XML‑to‑HTML transformation step via %define tool.xsltproc, which is accepted without...

UBUNTU-CVE-2026-56389

GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handling of grammar-defined configuration variables. A grammar file can override the executable used for the XML‑to‑HTML transformation step via %define tool.xsltproc, which is accepted without...

CVE-2026-56390 Arbitrary Output Location Change in GNU Bison

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing...