CVE-2026-57433

Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK record. retrieve_hook_common reads a signed 32-bit item count from an SX_HOOK record and calls av_extend with that count plus one. A count of I32_MAX wraps the addition to a negative value. A crafted blob passed to thaw or retrieve triggers the overflow; av_extend receives the negative count and dies with a panic, terminating the deserialization.

Perl 5 is a highly capable, feature-rich programming language with over 30 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large scale development projects.

Security Fix(es):

Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack.

S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds.

A template derived from untrusted input can read heap memory past the buffer and return it to the caller.(CVE-2026-57432)

Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK record.

retrieve_hook_common reads a signed 32-bit item count from an SX_HOOK record and calls av_extend with that count plus one. A count of I32_MAX wraps the addition to a negative value.

A crafted blob passed to thaw or retrieve triggers the overflow; av_extend receives the negative count and dies with a panic, terminating the deserialization.(CVE-2026-57433)

Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK record. retrieve_hook_common reads a signed 32-bit item count from an SX_HOOK record and calls av_extend with that count plus one. A count of I32_MAX wraps the addition to a negative value. A crafted blob passed to thaw or retrieve triggers the overflow; av_extend receives the negative count and dies with a panic, terminating the deserialization.

Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK record.

retrieve_hook_common reads a signed 32-bit item count from an SX_HOOK record and calls av_extend with that count plus one. A count of I32_MAX wraps the addition to a negative value.

A crafted blob passed to thaw or retrieve triggers the overflow; av_extend receives the negative count and dies with a panic, terminating the deserialization.

• SECURITY UPDATE: signed integer overflow when deserializing a crafted Storable SX_HOOK record
  • debian/patches/CVE-2026-57433.patch: reject a hook data item count of I32_MAX in retrieve_hook() in dist/Storable/Storable.xs before it is incremented and passed to av_extend()
  • CVE-2026-57433

• SECURITY UPDATE: signed integer overflow in Storable SX_HOOK deserialization
  • debian/patches/fixes/CVE-2026-57433.patch: croak on a hook data item count of I32_MAX before av_extend() is called with an overflowed negative count in retrieve_hook() in dist/Storable/Storable.xs
  • CVE-2026-57433

• SECURITY UPDATE: denial of service via signed integer overflow when deserializing a crafted Storable blob
  • debian/patches/CVE-2026-57433.patch: reject a hook data item count of I32_MAX in retrieve_hook_common() in dist/Storable/Storable.xs before it is incremented and passed to av_extend(); backported from upstream commit e4f681784bcdeaa91ff02a2fa4cdcae5c46779d7.
  • CVE-2026-57433

• SECURITY UPDATE: denial of service via signed integer overflow when deserializing a crafted Storable blob
  • debian/patches/fixes/CVE-2026-57433.patch: reject a hook data item count of I32_MAX in retrieve_hook_common() in dist/Storable/Storable.xs before it is incremented and passed to av_extend(); backported from upstream commit e4f681784bcdeaa91ff02a2fa4cdcae5c46779d7.
  • CVE-2026-57433

The updated Mageia 10 perl packages contain security fixes for CVE-2026-13221, CVE-2026-57432 and CVE-2026-57433. The Mageia 9 perl packages were not affected by CVE-2026-13221, they are now updated with fixes for CVE-2026-57432 and CVE-2026-57433.

Root has patched CVE-2026-57433 in the perl package for Root:Debian:11. Multiple fixed versions available.

Root has patched CVE-2026-57433 in the perl package for Root:Debian:12. Multiple fixed versions available.

Root has patched CVE-2026-57433 in the perl package for Root:Debian:13. Multiple fixed versions available.

It was discovered that Perl incorrectly handled short source addresses in the Socket module. An attacker could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure. (CVE-2026-12087)

It was discovered that Perl incorrectly handled regular expressions containing a large number of fixed string alternatives. An attacker could possibly use this issue to cause incorrect regular expression matches, resulting in security restrictions being bypassed. (CVE-2026-13221)

It was discovered that Perl incorrectly handled certain large repeat counts when processing pack and unpack templates. An attacker could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure. (CVE-2026-57432)

It was discovered that Perl incorrectly handled certain crafted data when deserializing with the Storable module. An attacker could possibly use this issue to trigger an integer overflow and application termination, resulting in a denial of service. (CVE-2026-57433)

USN-8675-1 fixed vulnerabilities in Perl. This update provides the corresponding fix for Perl on Ubuntu 26.04 LTS.

Original advisory details:

It was discovered that Perl incorrectly handled short source addresses in the Socket module. An attacker could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure. (CVE-2026-12087)

It was discovered that Perl incorrectly handled regular expressions containing a large number of fixed string alternatives. An attacker could possibly use this issue to cause incorrect regular expression matches, resulting in security restrictions being bypassed. (CVE-2026-13221)

It was discovered that Perl incorrectly handled certain large repeat counts when processing pack and unpack templates. An attacker could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure. (CVE-2026-57432)

It was discovered that Perl incorrectly handled certain crafted data when deserializing with the Storable module. An attacker could possibly use this issue to trigger an integer overflow and application termination, resulting in a denial of service. (CVE-2026-57433)

It was discovered that Perl incorrectly handled certain arguments to Socket and pack/unpack functions. An attacker could possibly use this issue to read sensitive information from memory. (CVE-2026-12087, CVE-2026-57432)

It was discovered that Perl incorrectly handled regular expressions with a large number of alternation branches. An attacker could possibly use this issue to cause incorrect matching results. (CVE-2026-13221)

It was discovered that Perl incorrectly handled certain files. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-57433, CVE-2025-15649, CVE-2026-48959, CVE-2026-9538)

It was discovered that Perl incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-48962)

It was discovered that Perl incorrectly handled credential headers during cross-origin redirects in HTTP::Tiny. An attacker could possibly use this issue to expose sensitive information. (CVE-2026-7017)