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Vulnerability Details :

CVE-2026-8796

Summary
Assigner-CPANSec
Assigner Org ID-9b29abf9-4ab0-4765-b253-1875cd9b441e
Published At-31 May, 2026 | 19:43
Updated At-01 Jun, 2026 | 18:42
Rejected At-
Credits

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:CPANSec
Assigner Org ID:9b29abf9-4ab0-4765-b253-1875cd9b441e
Published At:31 May, 2026 | 19:43
Updated At:01 Jun, 2026 | 18:42
Rejected At:
▼CVE Numbering Authority (CNA)
Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).

Affected Products
Vendor
YVES
Product
Sereal::Decoder
Collection URL
https://cpan.org/modules
Package Name
Sereal-Decoder
Repo
https://github.com/Sereal/Sereal
Program Files
  • Perl/Decoder/srl_decoder.c
Program Routines
  • srl_read_object()
  • srl_read_hash()
Default Status
unaffected
Versions
Affected
  • From 0 before 5.005 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-125CWE-125 Out-of-bounds Read
Type: CWE
CWE ID: CWE-125
Description: CWE-125 Out-of-bounds Read
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Upgrade to Sereal::Decoder 5.005 or later.

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Issue reported.2026-05-13 00:00:00
Fix released in Sereal::Decoder 5.005.2026-05-19 00:00:00
Fix verified against proofs of concept.2026-05-20 00:00:00
Event: Issue reported.
Date: 2026-05-13 00:00:00
Event: Fix released in Sereal::Decoder 5.005.
Date: 2026-05-19 00:00:00
Event: Fix verified against proofs of concept.
Date: 2026-05-20 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch
patch
https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes
release-notes
Hyperlink: https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch
Resource:
patch
Hyperlink: https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes
Resource:
release-notes
▼Authorized Data Publishers (ADP)
1. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/06/01/1
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/06/01/1
Resource: N/A
2. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.18.1HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:9b29abf9-4ab0-4765-b253-1875cd9b441e
Published At:31 May, 2026 | 20:16
Updated At:22 Jul, 2026 | 07:10

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.1HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
N/A
Type: Secondary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-125Secondary9b29abf9-4ab0-4765-b253-1875cd9b441e
CWE ID: CWE-125
Type: Secondary
Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch9b29abf9-4ab0-4765-b253-1875cd9b441e
N/A
https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes9b29abf9-4ab0-4765-b253-1875cd9b441e
N/A
http://www.openwall.com/lists/oss-security/2026/06/01/1af854a3a-2127-422b-91ae-364da2661108
N/A
Hyperlink: https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch
Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
Resource: N/A
Hyperlink: https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes
Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
Resource: N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/06/01/1
Source: af854a3a-2127-422b-91ae-364da2661108
Resource: N/A

Change History

0
Information is not available yet

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