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python3-ecdsa: fix CVE-2026-33936

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Details:
https://nvd.nist.gov/vuln/detail/CVE-2026-33936

Ptests passed:

root@qemux86:~# ptest-runner python3-ecdsa
START: ptest-runner
2026-04-11T08:04
BEGIN: /usr/lib/python3-ecdsa/ptest
...
...
Testsuite summary
# TOTAL: 1978
# PASS: 1974
# SKIP: 4
# XFAIL: 0
# FAIL: 0
# XPASS: 0
# ERROR: 0
DURATION: 386
END: /usr/lib/python3-ecdsa/ptest
2026-04-11T08:10
STOP: ptest-runner
TOTAL: 1 FAIL: 0

Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Ankur Tyagi
2026-04-11 23:14:46 +12:00
committed by Anuj Mittal
parent 8e106a9b12
commit 8ce4b233c6
2 changed files with 57 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta-python/recipes-devtools/python/python3-ecdsa/CVE-2026-33936.patch
+56
View File
@@ -0,0 +1,56 @@
From 41e6b7be293284ef8b1f102587f0da6eae1b753f Mon Sep 17 00:00:00 2001
From: 0xmrma <moabdelaal442004@gmail.com>
Date: Sun, 1 Mar 2026 09:18:21 +0200
Subject: [PATCH] der: reject truncated lengths in octet/implicit/constructed
CVE: CVE-2026-33936
Upstream-Status: Backport [https://github.com/tlsfuzzer/python-ecdsa/commit/bd66899550d7185939bf27b75713a2ac9325a9d3]
Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
---
src/ecdsa/der.py | 4 ++++
src/ecdsa/test_der.py | 13 +++++++++++++
2 files changed, 17 insertions(+)
diff --git a/src/ecdsa/der.py b/src/ecdsa/der.py
index b291485..5bbfaa3 100644
--- a/src/ecdsa/der.py
+++ b/src/ecdsa/der.py
@@ -137,6 +137,8 @@ def remove_constructed(string):
)
tag = s0 & 0x1F
length, llen = read_length(string[1:])
+ if length > len(string) - 1 - llen:
+ raise UnexpectedDER("Length longer than the provided buffer")
body = string[1 + llen : 1 + llen + length]
rest = string[1 + llen + length :]
return tag, body, rest
@@ -160,6 +162,8 @@ def remove_octet_string(string):
n = str_idx_as_int(string, 0)
raise UnexpectedDER("wanted type 'octetstring' (0x04), got 0x%02x" % n)
length, llen = read_length(string[1:])
+ if length > len(string) - 1 - llen:
+ raise UnexpectedDER("Length longer than the provided buffer")
body = string[1 + llen : 1 + llen + length]
rest = string[1 + llen + length :]
return body, rest
diff --git a/src/ecdsa/test_der.py b/src/ecdsa/test_der.py
index 0c2dc4d..28d231e 100644
--- a/src/ecdsa/test_der.py
+++ b/src/ecdsa/test_der.py
@@ -476,3 +476,16 @@ def test_oids(ids):
decoded_oid, rest = remove_object(encoded_oid)
assert rest == b""
assert decoded_oid == ids
+
+def test_remove_octet_string_rejects_truncated_length():
+ # OCTET STRING: declared length 4096, but only 3 bytes present
+ bad = b"\x04\x82\x10\x00" + b"ABC"
+ with pytest.raises(UnexpectedDER, match="Length longer than the provided buffer"):
+ remove_octet_string(bad)
+
+def test_remove_constructed_rejects_truncated_length():
+ # Constructed tag: 0xA0 (context-specific constructed, tag=0)
+ # declared length 4096, but only 3 bytes present
+ bad = b"\xA0\x82\x10\x00" + b"ABC"
+ with pytest.raises(UnexpectedDER, match="Length longer than the provided buffer"):
+ remove_constructed(bad)
meta-python/recipes-devtools/python/python3-ecdsa_0.19.0.bb
+1
View File
@@ -10,6 +10,7 @@ inherit pypi setuptools3 python3native ptest
SRC_URI += " \
file://run-ptest \
file://CVE-2026-33936.patch \
"
RDEPENDS:${PN}-ptest += " \